The iSeries is splitting up your SMTP email attachments.

Solution for OS/400 V4R1 and above:

OS/400 releases V4R1 and above do not require a PTF. All you need to do is create a new data area. 
To disable SMTP email message splitting: 
  1. Create a new data area called QUSRSYS/QTMSNOSPLT to turn email-message splitting off:


    Note: If you need to turn email-message splitting back on, delete this new data area.

    Note: Turning off email-message splitting may cause problems when sending large emails to mail clients that cannot handle large messages.

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Last Modified On: September 11, 2020